Standalone XML application context, taking the context definition files
from the file system or from URLs, interpreting plain paths as relative
file system locations (e.g. "mydir/myfile.txt"). Useful for test harnesses
as well as for standalone environments.

NOTE: Plain paths will always be interpreted as relative
to the current VM working directory, even if they start with a slash.
(This is consistent with the semantics in a Servlet container.)
Use an explicit "file:" prefix to enforce an absolute file path.